Watch no. 24
Case: Silver, hunting
Dial: White enamel, Roman numerals, subsidiary seconds
1857 - Potter, Boston
???? - The Time Museum, Rockford, Illinois Inventory No. 2291
2004 - Sotheby's New York, Masterpieces from the Time Museum, Part Four, October 13th and 14th, 2004, lot 710
2009 - Sotheby's, Apr 2009, est $15-20,000, sold $37,500, " A SILVER HUNTING CASED TOURBILLON WATCH WITH INCLINED BALANCE
• gilt lever movement, 9 jewels, one minute tourbillon carriage with inclined bi-metallic compensation balance, blued steel Breguet hairspring, glazed cuvette • white enamel dial, Roman numerals, subsidiary seconds • engine-turned case • dial and movement signed, barrel bridge inscribed Reed's Patent Nov. 24 1857.
Time Museum Inventory No. 2291
Sotheby's New York, Masterpieces from the Time Museum, Part Four, October 13th and 14th, 2004, lot 710
Randall, A., The Time Museum Catalogue of Chronometers, catalogue number 135, pp. 282-4.
The present watch features a standard movement of the Howard Watch Company which was fitted with a one minute tourbillon by A. H. Potter. This example displays Potter's original solution to the problem of changes in frictional dissipation by having the plane of the balance inclined 25% to the plane of the tourbillon.
For another tourbillon watch with inclined balance, see R. Walter Prendel, 'An Interesting Tourbillon,' in the NAWCC Bulletin, 3 (1949), pp. 636-637.